(function ($) {
	'use strict';

	// Use function construction to store map & DOM elements separately for each instance
	var MapField = function ($container) {
		this.$container = $container;
	};

	// Use prototype for better performance
	MapField.prototype = {
		// Initialize everything
		init              : function () {
			this.initDomElements();
			this.initMapElements();

			this.initMarkerPosition();
			this.addListeners();
			this.autocomplete();
		},

		// Initialize DOM elements
		initDomElements   : function () {
			this.canvas = this.$container.find('.rwmb-map-canvas')[0];
			this.$coordinate = this.$container.find('.rwmb-map-coordinate');
			this.$findButton = this.$container.find('.rwmb-map-goto-address-button');
			this.addressField = this.$findButton.val();
		},

		// Initialize map elements
		initMapElements   : function () {
			var defaultLoc = $(this.canvas).data('default-loc'),
				latLng;

			defaultLoc = defaultLoc ? defaultLoc.split(',') : [53.346881, -6.258860];
			latLng = new google.maps.LatLng(defaultLoc[0], defaultLoc[1]); // Initial position for map

			this.map = new google.maps.Map(this.canvas, {
				center           : latLng,
				zoom             : 14,
				streetViewControl: 0,
				mapTypeId        : google.maps.MapTypeId.ROADMAP
			});
			this.marker = new google.maps.Marker({ position: latLng, map: this.map, draggable: true });
			this.geocoder = new google.maps.Geocoder();
		},

		// Initialize marker position
		initMarkerPosition: function () {
			var coord = this.$coordinate.val(),
				l,
				zoom;

			if (coord) {
				l = coord.split(',');
				this.marker.setPosition(new google.maps.LatLng(l[0], l[1]));

				zoom = l.length > 2 ? parseInt(l[2], 10) : 14;

				this.map.setCenter(this.marker.position);
				this.map.setZoom(zoom);
			}
			else if (this.addressField) {
				this.geocodeAddress();
			}
		},

		// Add event listeners for 'click' & 'drag'
		addListeners      : function () {
			var that = this;
			google.maps.event.addListener(this.map, 'click', function (event) {
				that.marker.setPosition(event.latLng);
				that.updateCoordinate(event.latLng);
			});
			google.maps.event.addListener(this.marker, 'drag', function (event) {
				that.updateCoordinate(event.latLng);
			});

			this.$findButton.on('click', function () {
				that.geocodeAddress();
				return false;
			});
		},

		// Autocomplete address
		autocomplete      : function () {
			var that = this;

			// No address field or more than 1 address fields, ignore
			if (!this.addressField || this.addressField.split(',').length > 1) {
				return;
			}

			$('#' + this.addressField).autocomplete({
				source: function (request, response) {
					// TODO: add 'region' option, to help bias geocoder.
					that.geocoder.geocode({
						'address': request.term
					}, function (results) {
						response($.map(results, function (item) {
							return {
								label    : item.formatted_address,
								value    : item.formatted_address,
								latitude : item.geometry.location.lat(),
								longitude: item.geometry.location.lng()
							};
						}));
					});
				},
				select: function (event, ui) {
					var latLng = new google.maps.LatLng(ui.item.latitude, ui.item.longitude);

					that.map.setCenter(latLng);
					that.marker.setPosition(latLng);
					that.updateCoordinate(latLng);
				}
			});
		},

		// Update coordinate to input field
		updateCoordinate  : function (latLng) {
			this.$coordinate.val(latLng.lat() + ',' + latLng.lng());
		},

		// Find coordinates by address
		// Find coordinates by address
		geocodeAddress    : function () {
			var address,
				addressList = [],
				fieldList = this.addressField.split(','),
				loop,
				that = this;

			for (loop = 0; loop < fieldList.length; loop++) {
				addressList[loop] = jQuery('#' + fieldList[loop]).val();
			}

			address = addressList.join(',').replace(/\n/g, ',').replace(/,,/g, ',');

			if (address) {
				this.geocoder.geocode({ 'address': address }, function (results, status) {
					if (status === google.maps.GeocoderStatus.OK) {
						that.map.setCenter(results[0].geometry.location);
						that.marker.setPosition(results[0].geometry.location);
						that.updateCoordinate(results[0].geometry.location);
					}
				});
			}
		}
	};

	$(function () {
		$('.rwmb-map-field').each(function () {
			var field = new MapField($(this));
			field.init();

			$(this).data('mapController', field);
		});

		$('.rwmb-input').on('clone', function () {
			$('.rwmb-map-field').each(function () {
				var field = new MapField($(this));
				field.init();

				$(this).data('mapController', field);
			});
		});
	});

})(jQuery);
